Fan

ABSTRACT

The present invention is to provide a fan, comprising a nozzle mounted on a base; the nozzle comprising a first wall, a second wall, and a Coanda surface for producing Coanda effect, wherein the first wall assembles abreast to the second walls producing a slot to form a nozzle airflow outlet.

BACKGROUND OF THE INVENTION 1. Technical Field

The present invention relates to fans, and particularly to bladeless fans. In particular, the present invention relates to a fan that draws ambient air to increase its overall output airflow.

2. Description of Related Art

Fans typically have blades or vanes, which nevertheless hinder passage of light, are difficult to clean, compromise the portability of fans, and take up considerable space when the fans are used in vehicles.

A bladeless fan is disclosed in U.S. Pat. No. 2,488,467. Lacking a Coanda surface, however, this bladeless fan does not produce the Coanda effect, meaning the fan cannot entrain an airflow from the surroundings to increase the overall flow rate of the output airflow. In addition, known bladeless fans do not have a diffusion surface for guiding an airflow in a predetermined direction and therefore fail to guide an air current effectively.

Existing home air-cleaning devices are made without a Coanda surface at their vents, so unable to maximize their output by using Coanda effect to draw ambient air.

SUMMARY OF THE INVENTION

One objective of the present invention is to address the shortcomings that knowing bladeless fans or air-cleaning devices are unable to maximize their output by using Coanda effect to draw ambient air due to the absence Coanda effect.

The embodiments to present the advantages and features of the present invention are hereunder described with reference to accompanying drawings. However, the variation and modification according the present invention may still fall into the scope of the invention. The accompanying drawings and the illustration are not restrictive of the present invention.

To achieve the foresaid objective, the present invention provides a fan for speeding up airflow, comprising:

a base, for jetting airflow; and

a nozzle, mounted on the base for extending a range from which airflow is output, the nozzle including:

a nozzle airflow inlet, formed on the nozzle as an opening, for directly receiving airflow jutted from an airflow outlet of the base;

a first wall;

a second wall, arranged abreast and assembled to the first wall;

a first wall end, located at one end where the first wall is assembled abreast to the second wall;

a second wall end, located at opposite end where the first wall is assembled abreast to the second wall;

a first wall edge, being a wall edge where the first wall and the second wall extend toward one side and are assembled abreast;

a second wall edge, being a wall edge where the first wall and the second wall extend toward an opposite side and are assembled abreast, and having a nozzle airflow outlet for jetting airflow, wherein the first wall is folded reversely from one side of the second wall edge, and the second wall is folded inward reversely from one side of the second wall edge so as to from a closed surface or to be folded outward reversely so that the nozzle airflow outlet is formed between reverse folded parts of the first and second walls; and

a Coanda surface, deposited at the nozzle airflow outlet for guiding airflow by Coanda effect.

Further, the first wall end and the second wall end have two ends hereof extending and connected to each other so as to form a nozzle internal airflow channel or the first wall end and the second wall end are closed respectively so as to prevent airflow from flowing out the first wall end and the second wall end.

Further, the nozzle internal airflow channel is an annular space.

Further, the first wall end and the second wall end are connected directly to form the annular space that prevents airflow from flowing out.

Further, the base comprises: an internal fan, installed inside the base; a base airflow inlet, provided at one side of the internal fan as entrance of drawn airflow; a base airflow outlet, provided at the other side of the internal fan and the internal fan directly jets airflow to the base airflow outlet.

Further, the internal fan is a forced-draft fan, a jet turbine blade air-guiding fan or a flat fan.

Further, the nozzle airflow outlet is a tapered slot.

Further, the nozzle has a first closed surface formed by the first wall end being closed to prevent airflow from flowing out of the first wall end and a second closed surface formed by the second wall end being closed to prevent airflow from flowing out the second wall end.

Further, a third wall is provided between the first wall end and one side of the second wall end facing the second wall edge for preventing airflow from flow out.

Further, the fan further comprises one or a plurality of filtering pieces provided at the inner side of the base.

The present invention has the following beneficial effects compared with the prior art:

1. The present invention uses a Coanda surface to enhance airflow guidance, thereby drawing ambient air and increasing its output in terms of volume and velocity.

2. For achieving the foregoing objective, the disclosed fan has its nozzle airflow outlet designed with an outward or inward reverse folded structure so as to form a closed surface, thereby compressing its vent in size and guides air to flow smoothly, thereby increasing its output airflow in terms of volume and velocity.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a front schematic view of a preferred embodiment of the present invention.

FIG. 2 shows a partial perspective schematic view of a preferred embodiment of the present invention.

FIG. 3 shows a partial schematic view of a nozzle according to a preferred embodiment of the present invention.

FIG. 4 shows a partial schematic view of a nozzle according to another preferred embodiment of the present invention.

FIG. 5 shows a partial schematic view of a nozzle according to another preferred embodiment of the present invention.

FIG. 6 shows a front schematic view of another preferred embodiment of the present invention.

FIG. 7 shows a partial perspective schematic view of another preferred embodiment of the present invention.

FIG. 8 shows an external perspective view of a preferred embodiment of the present invention.

FIG. 9 shows a sectional schematic view of a preferred embodiment of the present invention.

FIG. 10 shows a schematic view of an internal fan according to a preferred embodiment of the present invention.

FIG. 11 shows a schematic view of an internal fan according to another preferred embodiment of the present invention.

FIG. 12 shows a schematic view of an internal fan according to another preferred embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

FIG. 1, FIG. 2, and FIG. 3 depict one preferred embodiment of the present invention. FIG. 1 is a front schematic view of a preferred embodiment of the present invention. FIG. 2 is a schematic drawing showing the inner structure of a preferred embodiment of the present invention. FIG. 3 is a partial, schematic view of a nozzle according to a preferred embodiment of the present invention.

The disclosed fan 10A comprises a base 11A for jetting airflow. The base 11A comprises an internal fan 110A installed inside the base 11A for jetting airflow, a base airflow inlet 111A provided at one side of the internal fan 110A as entrance of drawn airflow, a base airflow outlet 112A provided at the other side of the internal fan 110A as exit of jetted airflow, and one or a plurality of filtering pieces 13A provided at the inner side of the base 11A. In one preferred embodiment, the filtering piece is a filter screen, a filter cloth, a filter paper, a wet filter cotton sheet, a wet filter cloth, or a wet filter paper, and the present invention places no limitation thereto. The fan 10A also has a nozzle 12A. The nozzle 12A is mounted on the base 11A, and is hollowed at most of its central area for allowing light and airflow to pass therethrough, thereby extending the range from which air is input. The nozzle 12A has: a nozzle airflow inlet 121A, provided at the nozzle 12A as an opening, for receiving airflow jutted out from the base airflow outlet 112A; a nozzle airflow outlet 122A for jetting airflow; a nozzle internal airflow channel 123A (as shown in FIG. 3) for air to flow therein; a first wall 124A; a second wall 125A, assembled abreast to the first wall 124A; a Coanda surface 126A, being close to the nozzle airflow outlet 122A for generating Coanda effect that increases the overall final output in volume; and a diffusing surface 127A, for guiding airflow to following the predetermined direction.

FIG. 3 is a partial schematic view of the nozzle 12A according to an embodiment of the present invention. The nozzle 12A is mounted on the base 11A, thereby extending the range from which air is input. As shown, the nozzle 12A is hollowed at most of its central area, and has a nozzle airflow inlet 121A, located at the nozzle 12A as an opening for receiving airflow jutted from the base 11A; a first wall 124A; a second wall 125A, assembled abreast to the first wall 124A; a first wall end 131A, located at one end where the first wall 124A is assembled abreast to the second wall 125A; a second wall end 132A, located at the other end where the first wall 124A is assembled abreast to the second wall 125A, wherein the first wall end 131A and the second wall end 132A have two ends thereof extending and connected to each other in an annular or folded manner so as to form a nozzle internal airflow channel 123A (an annular space) that prevents airflow from flowing out the first wall end 131A and second wall end 132A and makes the nozzle an annular, hollow structure, which is hollowed at most of its central area, for allowing light and airflow to pass therethrough (in other embodiments the first wall end 131A and the second wall end 132A are closed respectively so as to prevent air from flowing out the first wall end 131A and the second wall end 132A); a first wall edge 129A, being the wall edge where the first wall 124A and the second wall 125A extend toward one side and are assembled abreast; a second wall edge 130A, being the wall edge where the first wall 124A and the second wall 125A extend toward the other side and are assembled abreast, and having a nozzle airflow outlet 122A for jetting airflow, wherein the first wall 124A is folded reversely from one side of the second wall edge 130A, and the second wall 125A is folded inward reversely from one side of the second wall edge 130A to form a closed surface, while the nozzle airflow outlet 122A is formed between the reverse folded parts of the first wall 124A and the second wall 125A; a Coanda surface 126A, provided at the nozzle airflow outlet 122A for guiding airflow using Coanda effect that increases the overall final output in volume, wherein while in the present embodiment the Coanda surface 126A extends from the second wall 125A, in another preferred embodiment, the Coanda surface 126A may extend from the first wall 124A, and the present invention places no limitation thereto; a diffusing surface 127A, formed by the terminal of the put abreast and folded first walls 124A and second walls 125A, the diffusing surface 127A being formed by the terminal of the Coanda surface 126A, guiding airflow to following the predetermined direction; and a third wall 128A, provided between the first wall end 131A and one side of the second wall end 132A facing the second wall edge 129A, for preventing air from flowing out.

In another preferred embodiment, as shown in FIG. 4, which is a schematic drawing of a nozzle of the present invention, the nozzle 12B is mounted on the base 11A for extending the range from which air is input. The nozzle 12B is hollowed at most of its central area, and has a nozzle airflow inlet 121B, located on the nozzle 12B as an opening for receiving airflow jetted by the base; a first wall 124B; a second wall 125B, arranged abreast and assembled to the first wall 124B; a first wall end 131B, located at one end where the first wall 124B and the second wall 125B are assembled abreast; a second wall end 132B, located at the other end where the first wall 124B and the second wall 125B are assembled abreast, wherein the first wall end 131B and the second wall end 132B have two ends thereof extending and connected to each other in an annular or folded manner so as to form the internal airflow channel that prevents air from flowing out the first wall end 131B and the second wall end 132B and makes the nozzle 12B an annular, hollow structure, which is hollowed at most of its central area, for allowing light and airflow to pass therethrough, in other embodiments the first wall end 131B and the second wall end 132B are closed respectively so as to prevent air from flowing out the first wall end 131B and the second wall end 132B; a first wall edge 129B, being the wall edge where the first wall 124B and the second wall 125B extend toward one side and are assembled abreast; a second wall edge 130B, being the wall edge where the first wall 124B and the second wall 125B extend toward the other side and are assembled abreast, and having a nozzle airflow outlet 122B for jetting airflow, wherein the first wall 124B is folded reversely from one side of the second wall edge 130B, and the second wall 125B is folded outward from one side of the second wall edge 130B, while the nozzle airflow outlet 122B is formed between the folded parts of the first wall 124B and the second wall 125B; a Coanda surface 126B, provided at the nozzle airflow outlet 122B, for using Coanda effect to guide airflow, thereby increasing the overall final output in volume, wherein while in the present embodiment, the Coanda surface 126B is formed by extending the second wall 125B, in another preferred embodiment, the Coanda surface 126B may be extended from the first wall 124B, and the present invention places no limitation thereto; a diffusing surface 127B, formed by the terminal of the placed abreast and folded the first wall 124B and the second wall 125B, the diffusing surface 127B being formed of the terminal of the Coanda surface 126B for guiding airflow to following the predetermined direction; and a third wall 128B, provided between the first wall end 131B and one side of the second wall end 132B facing the second wall edge 129B, for preventing air from flow out. In the present embodiment, airflow does not stay in the nozzle internal airflow channel 123B to form turbulence and cause rough airflow.

FIG. 5 is a partial schematic view of the nozzle according to another preferred embodiment of the present invention. As shown, the nozzle 12C is mounted on the base, thereby extending the range from which air is input. The nozzle 12C is hollowed at most of its central area, and has a nozzle airflow inlet 121C, located at nozzle 12C as an opening. The nozzle airflow inlet 121C is located at first wall edge 129C, for receiving airflow jetted by the base; a first wall 124C; a second wall 125C, assembled abreast to the first wall 124C; a first wall end 131C, located at one end where the first wall 124C and the second wall 125C are assembled abreast; a second wall end 132C, located at the other end where the first wall 124C and the second wall 125C are assembled abreast, wherein the first wall end 131C and the second wall end 132C have two ends thereof extending and connected to each other in an annular or folded manner so as to form the internal airflow channel that prevents air from flowing out the first wall end 131C and the second wall end 132C and makes the nozzle 12C an annular, hollow structure, which is hollowed at most of its central area, for allowing light and airflow to pass therethrough (in other embodiments the first wall end 131C and the second wall end 132C are closed respectively so as to prevent air from flowing out the first wall end 131C and the second wall end 132C); a first wall edge 129C, being the wall edge where the first wall 124C and the second wall 125C extend toward one side, the nozzle airflow inlet 121C being located at first wall edge 129C; a second wall edge 130C, being the wall edge where the first wall 124C and the second wall 125C extend toward the other side and are assembled abreast, and having a nozzle airflow outlet 122C for jetting airflow, wherein the first wall 124C is folded reversely from one side of the second wall edge 130C, and the second wall 125C is folded outward reversely from one side of the second wall edge 130C, while the nozzle airflow outlet 122C is formed is formed between the reverse folded parts of the first wall 124C and the second wall 125C; a Coanda surface 126C, provided at the nozzle airflow outlet 122C for using Coanda effect to guide airflow, so as to increase the overall final output in volume, wherein the present embodiment, the Coanda surface 126C extends from the second wall 125C, while in another preferred embodiment, the Coanda surface 126C may extend from the first wall 124C, and the present invention places no limitation thereto; a diffusing surface 127C, formed by the terminal of the put abreast and folded first and second walls 124C and 125C, the diffusing surface 127C being formed by the terminal of the Coanda surface 126C, for guiding airflow to following the predetermined direction. In the present embodiment, airflow may enter from the first wall edge 129C.

FIG. 6 is a front view of a fan according to another preferred embodiment of the present invention. FIG. 7 is a schematic drawing showing the inner structure of the fan of another preferred embodiment of the present invention.

The present embodiment discloses a fan 10D, which comprises: a base 11D for jetting airflow. The base 11D comprises an internal fan 110D installed inside the base 11D for jetting airflow, a base airflow inlet 111D provided at one side of the internal fan 110D as an entrance of drawn-in air, a base airflow outlet 112D provided at the other side of the internal fan 110D as an exit of jetted airflow, and one or a plurality of filtering pieces 13D provided at the inner side of the base 11D. In one preferred embodiment, the filtering piece may be a filter screen, a filter cloth, a filter paper, a wet filter cotton sheet, a wet filter cloth, or a wet filter paper, and the present invention places no limitation thereto. The fan 10D also comprises a nozzle 12D. The nozzle 12D is mounted on the base 11D. The nozzle 12D is hollowed at most of its central area, for allowing light and airflow to pass therethrough, thereby extending the range from which air is input. The nozzle 12D has: a nozzle airflow inlet 121D, provided at the nozzle 12D as an opening, for receiving airflow jetted from the base airflow outlet 112D; a nozzle airflow outlet 122D, for jetting airflow; a nozzle internal airflow channel, being an annular space for airflow to flow therein; a first wall 124D; a second wall 125D, assembled abreast to the first wall 124D; a first wall end 131D, located at one end where the first wall 124D is assembled abreast to the second wall 125D, and the first wall end 131D being closed to form a first closed surface that prevents airflow from flowing out of the first wall end 131D; a second wall end 132D, located at the other end where the first wall 124D is assembled abreast to the second wall 125D, the second wall end 132D being closed to form a second closed surface that prevents airflow from flowing out the second wall end 132D; a Coanda surface 126D, being close to the nozzle airflow outlet 122D, for generating Coanda effect that increases the overall final output in volume; and a diffusing surface 127D, for guiding airflow to following the predetermined direction. In the present embodiment, the first wall end 131D and the second wall end 132D are closed respectively so as to prevent airflow from flowing out the first wall end 131D and the second wall end 132D.

FIG. 8 is an external schematic view of the fan according to still another preferred embodiment of the present invention. FIG. 9 is a cross-sectional schematic view of the fan according to still another preferred embodiment of the present invention.

The present embodiment discloses a flat fan. The fan 10F comprises a base 11F for jetting airflow. The base 11F comprises an internal fan 110F installed inside the base 11F for jetting airflow, a base airflow inlet 111F provided at one side of the internal fan 110F one side as entrance of drawn airflow, a base airflow outlet 112F provided at the other side of the internal fan 110F as exit of jetted airflow, and one or a plurality of filtering pieces 13F provided at the inner side of the base 11F. In one preferred embodiment, the filtering piece 13F is a filter screen, a filter cloth, a filter paper, a wet filter cotton sheet, a wet filter cloth, or a wet filter paper, and the present invention places no limitation thereto. The fan 10F also comprises a nozzle 12F, which is mounted on the base 11F. The nozzle 12F is hollowed at most of its central area, for allowing light and airflow to pass therethrough, thereby extending the range from which air is input. The nozzle 12F has: a nozzle airflow inlet 121F, provided at the nozzle 12F as an opening, for receiving airflow jutted from the base airflow outlet 112F; a nozzle airflow outlet 122F, being a tapered slot for jetting airflow; a nozzle internal airflow channel 123F for airflow to flow therein; a first wall 124F; a second wall 125F, assembled abreast to the first wall 124F; a first wall end 131F, located at the one end of first wall 124F that is assembled abreast to the second wall 125F, the first wall end 131F being closed to form a first closed surface that prevents airflow from flowing out the first wall end 131F; a second wall end 132F, located at opposite end where the first wall 124F is assembled abreast to the second wall 125F, the second wall end 132F being closed to form a second closed surface that prevents airflow from flowing out the second wall end 132F; a Coanda surface 126F, being close to the nozzle airflow outlet 122F for generating Coanda effect that increases the overall final output in volume; and a diffusing surface 127F, for guiding airflow to following the predetermined direction. In the present embodiment, the flat fan is a single linear one for providing a single linear stream of airflow, thereby downsizing the fan's nozzle, and making the fan more portable and convenient.

The following description will be directed to different embodiments of the internal fan used in the present invention.

FIG. 10 is a schematic view of an internal fan according to a preferred embodiment of the present invention.

The present embodiment discloses that the internal fan is a jet turbine blade air-guiding fan 113A for drawing airflow and jetting airflow. The jet turbine blade air-guiding fan 113A has a turbine airflow outlet 114A; a turbine airflow inlet 115A; a turbine blade 116A; and a turbine motor 117A. Therein, the turbine blade 116A is vortex-like for concentrating airflow centrally and sending airflow out toward the turbine airflow outlet 114A at one side.

Please refer to FIG. 11 for another preferred embodiment of the internal fan used in the present invention.

The present embodiment discloses that the internal fan is a forced-draft fan 113B for drawing airflow and jetting airflow. The forced-draft fan 113B has a forced-draft fan airflow outlet 114B; a forced-draft fan airflow inlet 115B; forced-draft fan blades 116B; and a forced-draft fan motor 117B. Therein, the forced-draft fan blade 116B has a curved surface for concentrating airflow centrally and sending airflow out toward the forced-draft fan airflow outlet 114B at one side.

Please refer to FIG. 12 for still another preferred embodiment of the internal fan used in the present invention.

The present embodiment discloses that the internal fan is a flat fan 113C for drawing airflow and jetting airflow. The flat fan 113C has a flat fan airflow outlet 114C; a flat fan airflow inlet 115C; a flat fan blades 116C; and a flat fan motor 117C. The flat fan 113C draws in airflow from the front side (the flat fan airflow inlet 115C), and sends airflow toward the rear side of the flat fan 113C (the flat fan airflow outlet 114C), thereby guiding airflow.

The present invention provides a fan that eliminates the problem of existing fans that their blades interference light and are difficult to clean; the problem of known bladeless fan that they are unable to use Coanda effect and thus the output is limited; the problem of conventional bladeless fans that they have no diffusing surface to guide output airflow; and problem of existing bladeless fans that their nozzle is disadvantageously bulky.

The present invention is such valuable in this field so that submit an application. While example embodiments have been disclosed herein, it should be understood that other variations may be possible. Such variations are not to be regarded as a departure from the spirit and scope of example embodiments of the present application, and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the following claims. 

What is claimed is:
 1. A fan for speeding up airflow, comprising: a base, for jetting airflow; and a nozzle, mounted on the base for extending a range from which airflow is output, the nozzle including: a nozzle airflow inlet, formed on the nozzle as an opening, for directly receiving airflow jutted from an airflow outlet of the base; a first wall; a second wall, arranged abreast and assembled to the first wall; a first wall end, located at one end where the first wall is assembled abreast to the second wall; a second wall end, located at opposite end where the first wall is assembled abreast to the second wall; a first wall edge, being a wall edge where the first wall and the second wall extend toward one side and are assembled abreast; a second wall edge, being a wall edge where the first wall and the second wall extend toward an opposite side and are assembled abreast, and having a nozzle airflow outlet for jetting airflow, wherein the first wall is folded reversely from one side of the second wall edge, and the second wall is folded inward reversely from one side of the second wall edge so as to from a closed surface or is folded outward reversely so that the nozzle airflow outlet is formed between reverse folded parts of the first and second walls; and a Coanda surface, deposited at the nozzle airflow outlet for guiding airflow by Coanda effect.
 2. The fan of claim 1, wherein the first wall end and the second wall end have two ends thereof extending and connected to each other so as to form a nozzle internal airflow channel or the first wall end and the second wall end are closed respectively so as to prevent airflow from flowing out the first wall end and the second wall end.
 3. The fan of claim 2, wherein the nozzle internal airflow channel is an annular space.
 4. The fan of claim 3, wherein the first wall end and the second wall end are connected directly to form the annular space that prevents airflow from flowing out.
 5. The fan of claim 1, wherein the base comprises: an internal fan, installed inside the base; a base airflow inlet, provided at one side of the internal fan as entrance of drawn airflow; a base airflow outlet, provided at the other side of the internal fan and the internal fan directly jets airflow to the base airflow outlet.
 6. The fan of claim 4, wherein the internal fan is a forced-draft fan, a jet turbine blade air-guiding fan or a flat fan.
 7. The fan of claim 1, wherein the nozzle airflow outlet is a tapered slot.
 8. The fan of claim 1, wherein the nozzle has a first closed surface formed by the first wall end being closed to prevent airflow from flowing out of the first wall end and a second closed surface formed by the second wall end being closed to prevent airflow from flowing out the second wall end.
 9. The fan of claim 1, wherein a third wall is provided between the first wall end and one side of the second wall end facing the second wall edge for preventing airflow from flow out.
 10. The fan of claim 1, wherein the fan further comprises one or a plurality of filtering pieces provided at the inner side of the base. 